# def my_function(a, b, c=None):
#     params_dict = locals()
#     # del params_dict['my_function']  # 删除函数名
#     print(c)
#     if c is None:
#         print('true')
#     print(params_dict)
#
# my_function(1, 2)
#
# a = {'a': 1, 'b': 2, 'c': 3}
#
# for it in a.keys():
#     print(it)

list1=[]
if not list1:
    print("空")